英語翻譯
water production begins first in wells completed low in the strucutre because the water,in its displacing action on oil,arrives at these wells first.water production in these wells increases continuously until the wells must be abandoned because oil production is insufficient to economically justify their continued operation.A much larger portion of oil originall in the reservoir is recovered by energy andaction of a water drive than by either dissolved-gas drive or gas-cap drive.such recovery normally will be approximately 35 to 75 per cent of original oil in place